1+2+2+..........+98+99+99+100=(1+100)+2.2+3.2+.............+99.2
=101+2.(2+3+4+....+99)=101+2.(99+2).98:2
=101+2.4949=101+9898=9999
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Các câu hỏi tương tự
tính nhanh (2/3+3/4+5/6+...+99/100).(1/2+2/3+3/4+...+98/99)-(1/2+1/3+...+99/100).(2/3+2/4+...+98/99)
Cho A = 100+1/99+2/98+...99/1
B = 100-1/2-2/3-3/4-...-98/99
Tính A/B
1*2*3+2*3*4+3*4*5+....+97*98*99+98*99*100 = ?
99/1+98/2+97/3+................+2/98+1/99
1/2+1/3+1/4+.......................+1/99+1/100
Tính nhanh
a.(1+1/2)×(1+1/3)×(1+1/4)×...×(1+1/98)×(1+1/99).
b.1/2×2/3×3/4×...×97/98×98/99×99/100
A = 100 + 99 - 98 -97 + 86 + 95 - 94 - 93 + ... + 4 + 3 - 2 - 1 tim A
Tính A:B
a)A=98+1/2+1/3+1/4+...+1/99
B=2/3+4/3+5/4+...+100/99
b)A=2018+1/2+1/3+1/4+...+1/2019
B=3/2+4/3+3/4+...+2020/2019
c)A=99/1+98/2+97/3+...+2/98+1/99
B=1/2+1/3+1/4+...+1/100
Giải đầy đủ
\(\frac{101+100+99+98+.....+5+4+3+2+1}{101-100+99-98+...+5-4+3-2+1}\)
1/2 +2/3 +3/4 +4/5+..+99/100
1/99+2/98 +3/97+...+98/2+99/1
help me,ai giải nhanh nhất tớ tick cho